One stiff spring. I used the springs that came with the bed leveling kits

3x M3 30mm bolts

4x M3 20mm bolts

7x M3 nuts

one U -Groove ball bearing and appropriate screw to keep in place

EDIT: Old parts list, just get a few M3 40mm bolts,nuts and washers. That and one M4 40mm bolt, nut and washer for the spring at the rear of the finger. And one M4 20mm Hex Head bolt + nut + washer for the u-groove bearing

Assembly

Assembly is easy.
Strip the old cube head entirely, removing the metal frame that the stepper motor is bolted to.
Print all of the parts and assemble as such:

Main Body to the cube print head

Insert the support plate

Insert the rigid plate

Insert the E3D cooling tower

Bolt the stepper in place, through the main body, support and rigid plate

Assemble the bearing unto the finger and affix to the main body

Insert the spring at the top - I used an 20mm bolt to keep the spring in place. It sits snugly on top of an M3 hex nut.

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